Titration Experiment

This helps to produce a more reliable result, as it is easier to monitor the changes; therefore it prevents the mixture from turning too dark.
             - 150ml Iodine Solution.
             - 100ml Vitamin C Solution.
             - 100ml Pineapple juice.
             - 100ml Orange juice.
             - Starch .
             - Acid.
             Methods .
             Before starting the experiment, create a table that looks like the one suggested below to record the results. .
             VC 1 25ml.
             VC 2 25ml.
             VC 3 25ml.
             OJ 1 25ml.
             OJ 2 25ml.
             OJ 3 25ml.
             PJ 1 25ml.
             PJ 2 25ml.
             PJ 3 25ml.
             2nd reading.
             (ml).
             1st reading.
             (ml).
             Volume of iodine used.
             (ml).
             1. Measure 25ml of Vitamin C using the pipette into the conical flask.
             2. Measure 1ml of starch and a drop acid into the conical flask.
             3. Put the conical flask above the white tile underneath the burette.
             4. Before adding the iodine, record the level of iodine in the burette and write it on the 1st reading. .
             5. Slowly add the iodine to the conical flask whilst swirling the conical flask at the same time, until a colour change of blue started permanently showed. .
             6. Record the new level of iodine and write it on the 2nd reading.
             7. Work the total amount of iodine added by subtracting the second reading of iodine by the first reading of iodine. (second reading – first reading = volume of iodine used ).
             8. Repeat the same procedure using vitamin C until it you have completed 3 vitamin C results. .
             9. Follow steps 1 to 8 replacing Vitamin C with fruit juices in the conical flask until you have achieved 3 result for each fruit juice. .
             10. Work out the total average amount of iodine needed for Vitamin C, pineapple and orange juice. By adding all the volume of iodine used and dividing the answer by three to get the average amount of iodine used. .
             Health and Safety.
             Before adding the iodine to the burette, you have to ensure that the tip of the burette is the same eye level with person who is adding the chemical. If not, hold the middle and the bottom part the stand with the burette and gently place it on the floor and add the iodine using the flannel.